The Citroën PHZ, also known as XUD11ATE, is a 1,868 cc, inline — four turbo — diesel engine produced between 1989 and 1996. It features indirect injection, a SOHC 8 — valve configuration, and belt — driven camshaft timing. In standard form, it delivers 66 kW (90 PS) and 180 Nm of torque, offering improved performance over naturally aspirated variants while retaining strong fuel economy.
Fitted to models such as the Citroën BX Turbo D, ZX Turbo D, and XM, the PHZ (XUD11ATE) was en…
All production years 1989–1996 meet Euro 1 emissions standards (VCA UK Type Approval #VCA/EMS/3210).
The Citroën PHZ (XUD11ATE) is a 1,868 cc inline-four turbo-diesel engine designed for performance-oriented diesel applications (1989–1996). It combines indirect injection with a SOHC 8-valve layout and Garrett T2 turbocharger to deliver responsive mid-range power. Designed to meet Euro 1 standards, it balances improved performance with acceptable fuel consumption in mid-size PSA vehicles.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,868 cc | |
Fuel type | Diesel | |
Configuration | Inline-4, SOHC, 8-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 79.0 mm × 95.0 mm | |
Power output | 66 kW (90 PS) @ 4,600 rpm | |
Torque | 180 Nm @ 2,200 rpm | |
Fuel system | Mechanical indirect injection (Bosch VE-type rotary pump) | |
Emissions standard | Euro 1 | |
Compression ratio | 22.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Garrett T2 (wastegate controlled by vacuum actuator) | |
Timing system | Single timing belt (front-mounted) | |
Oil type | SAE 15W-40 (PSA B71 2290) | |
Dry weight | 148 kg |
The Citroën PHZ (XUD11ATE) was used across Citroën's BX/ZX platforms with transverse mounting and shared within the PSA Group for use in Peugeot compact models. This engine received platform-specific adaptations-tuned boost pressure in the BX Turbo D and revised intercooler plumbing in the XM-and from 1992 the updated ZX adopted revised actuator calibration, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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The PHZ (XUD11ATE)'s primary reliability risk is turbocharger actuator failure in early production units, with elevated incidence in high-mileage vehicles used for sustained motorway driving. PSA internal reports from 1993 indicated a measurable number of pre-1992 engines requiring actuator replacement before 140,000 km, while VCA MOT data shows timing belt failures as a secondary cause of engine damage. Extended service intervals and use of incorrect oil increase thermal and mechanical stress, making adherence to 60,000 km or 4-year timing belt replacement critical.
Analysis derived from PSA technical bulletins (1989-1996) and UK DVSA failure statistics (1990-2005). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The PHZ (XUD11ATE) offers solid performance and good durability when maintained. Early models (1989-1991) are prone to turbo actuator failure if service intervals are deferred. Post-1992 revisions significantly improved actuator longevity. With regular timing belt changes, correct oil (15W-40 PSA B71 2290), and vacuum system maintenance, these engines can reliably exceed 250,000 km.
Key issues include turbocharger actuator failure (especially pre-1992), timing belt degradation, intercooler hose leaks, and Bosch VE pump wear. These are documented in PSA technical bulletins and owner networks. Preventive maintenance—especially belt replacement and vacuum line inspection—greatly reduces failure risk.
The PHZ (XUD11ATE) 1.9L turbo diesel was used in the Citroën BX Turbo D (1989-1993), ZX Turbo D (1991-1996), and XM (1989-1995). It was also shared across PSA Group models including the Peugeot 405 and 605. All applications were transversely mounted and met Euro 1 standards.
Tuning potential is limited. The indirect-injection, mechanically controlled design restricts output. Minor gains (5–10 kW) may be achieved via injection pump recalibration, but risks fuel system damage. Turbo upgrades are rare due to chassis and cooling limitations. Most owners prioritise reliability and drivability over performance modifications.
Good for a turbo diesel of its era. In the Citroën ZX Turbo D, combined consumption is ~6.2 L/100km (46 mpg UK), with highway driving as low as 5.3 L/100km. Real-world figures depend on driving style, but expect 40–47 mpg (UK) under mixed conditions. Its balance of performance and efficiency made it popular for long-distance driving.
Yes. The PHZ (XUD11ATE) is an interference engine. If the timing belt fails or jumps, the pistons can strike the valves, causing severe internal damage. Adhering to the 60,000 km or 4-year replacement interval is essential to prevent costly repairs.
PSA specifies SAE 15W-40 mineral oil meeting PSA B71 2290 standard. Use of modern low-SAPS or multi-grade oils is not recommended. Change oil every 15,000 km to protect the high-compression engine and turbocharger bearings.
Comprehensive technical documentation and regulatory references
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Regulatory Stability
EU regulations are referenced using CELEX identifiers for long-term stability.
CITROEN Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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